From: Ville Syrj?l? <ville.syrjala at linux.intel.com>
Seeing the watermark latency values in dmesg might help sometimes.
Signed-off-by: Ville Syrj?l? <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 37919df..5687957 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2392,6 +2392,24 @@ static void intel_fixup_cur_wm_latency(struct drm_device *dev, uint16_t wm[5])
wm[3] *= 2;
}
+static void intel_print_wm_latency(struct drm_device *dev, const uint16_t wm[5])
+{
+ int level;
+
+ for (level = 0; level <= 4; level++) {
+ unsigned int latency = wm[level];
+
+ if (latency == 0)
+ continue;
+
+ if (level > 0)
+ latency *= 5;
+
+ DRM_DEBUG_KMS(" WM%d latency %u (%u.%u usec)\n",
+ level, wm[level], latency / 10, latency % 10);
+ }
+}
+
static void intel_setup_wm_latency(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -2405,6 +2423,13 @@ static void intel_setup_wm_latency(struct drm_device *dev)
intel_fixup_spr_wm_latency(dev, dev_priv->wm.spr_latency);
intel_fixup_cur_wm_latency(dev, dev_priv->wm.cur_latency);
+
+ DRM_DEBUG_KMS("Primary watermark latencies:\n");
+ intel_print_wm_latency(dev, dev_priv->wm.pri_latency);
+ DRM_DEBUG_KMS("Sprite watermark latencies:\n");
+ intel_print_wm_latency(dev, dev_priv->wm.spr_latency);
+ DRM_DEBUG_KMS("Cursor watermark latencies:\n");
+ intel_print_wm_latency(dev, dev_priv->wm.cur_latency);
}
static void hsw_compute_wm_parameters(struct drm_device *dev,
--
1.8.1.5
